Principle and test plan of elevator traction machine

I believe many people have this experience: I want to go to the top 10th floor, but the elevator can only go to the 9th floor, then climb the stairs, and find a mysterious, closed door in the place where there should be an elevator on the 10th floor. , the three big characters "mechanical room". Why does this room exist? This starts with the principle structure of the elevator.

The power part of the traditional elevator is mainly composed of a traction machine (winding machine), a frequency converter, a car, a wire rope, and a counterweight. The traction machine adjusts the balance of the car height by rolling the wire rope to adjust the balance between the car and the counterweight, that is, the upper and lower sides of the elevator. The traction machine is essentially a high-power motor driven and controlled by the inverter, which needs to be placed on the top floor of the building. This causes the elevator to be unable to go to the top floor because the elevator position on the top floor is driven by the traction machine and the inverter. occupied. This problem has been around for a long time, because in the past the traction machine basically used AC asynchronous motor, and the power is easy to get tens of KW, the volume is very large, and can not be placed in the open air, can only occupy the room on the top floor.

Figure 1 Common elevator original map

However, with the increasing popularity of PM motors (permanent magnet synchronous motors), the top layer of the elevator has become possible. One major difference between a PM motor and an AC asynchronous motor is that the volume, weight, and power density are greatly reduced, and the space occupied by the same power is smaller. Moreover, the PM motor has better torque output performance at low speed, and it has a great improvement in control precision and control speed compared with the conventional asynchronous motor.

In particular, the traction machine manufactured by the PM motor can make the volume small and flat, and the small traction machine can accommodate the traction machine. Like some of the current industry-based machine room elevator solutions, the permanent magnet synchronous traction machine and its professional frequency converter (thin to 90mm) will be installed directly in the elevator shaft, thus saving the space of the roof elevator machinery room. At the same time, the elevator can also pull the car directly to the top.

GB 24478-2009 national standard traction machine test solution

The nature of the traction machine is also a kind of variable frequency speed control motor, and it belongs to the frequently used electrical equipment, so the accurate measurement of its efficiency is very important. For the testing of the traction machine, Zhou Ligong Zhiyuan Electronics launched the MPT motor test system, which can comprehensively measure and analyze the overall performance of the traction machine. The test items and precision fully meet the national standard requirements of the GB 24478-2009 elevator traction machine industry.